Term
Switching
What device segments a LAN? |
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Definition
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Term
Switching
When using bridges/switches, what do these devices do to bandwidth? |
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Definition
Effectively double the bandwidth for each LAN segmented.
I.E. If the total bandwidth was 10MBPS, then each segment would have 10 MBPS to itself so in effect, having 20 MBPS (2 LAN segments) |
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Term
Switching
Define microsegmentation? |
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Definition
| A switch’s effect of segmenting an Ethernet LAN into one collision domain per interface is sometimes called microsegmentation |
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Term
Switching
What is always used to learn MAC addresses for MAC address tables? |
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Definition
| Learning always occurs by looking at the source MAC address in the frame |
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Term
Switching
Switches flood ___ addresses and ___ addresses |
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Definition
Unknown unicast frames (learning process)
Broadcast frames |
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Term
Switching
Switch and the inactivity timer |
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Definition
-In a switches MAC address table, the switch sets the timer to 0 for new entries.
-Each time the switch receives another frame with that same source MAC address, the timer is reset to 0.
-Timer counts up so the switch can tell which entries have gone the longest without receiving a frame from that device.
- If MAC table runs out of space, can drop the entries with the oldest (largest) inactivity timers |
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Term
Switching
Fragment free switching waits till the __ __ of a frame are received till it forwards the frame, thus what happens with error-ed frames? |
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Definition
Waits till the first 64 bytes before forwarding a frame. Error-ed frames are not forwarded
(collisions happen within the first 64 bytes of a frame) |
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Term
Switching
Cut through switching, what happens with error-ed frames and why? |
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Definition
| Error-ed frames are forwarded because the FCS is at the end of the frame. |
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Term
Switching
To read/memorize
LAN Switching Summary |
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Definition
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Switch ports connected to a single device microsegment the LAN, providing dedicated bandwidth to that single device.
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Switches allow multiple simultaneous conversations between devices on different ports.
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Switch ports connected to a single device support full duplex, in effect doubling the amount of bandwidth available to the device.
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Switches support rate adaptation, which means that devices that use different Ethernet speeds can communicate through the switch (hubs cannot).
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Term
Switching
Explain why an interface would have 200 Mbps in a collision domain rather then shared or just the 100 Mbps? |
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Definition
-If an interface is connected to a switch port, I.E. 1 device on each switchport, no collisions would occur.
-Full duplex can then be used on each interface. |
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